Casement window operator



May 31, 1938. F. c. GARRloN CASEMENT WINDOW OPERATOR A Filed May 17, 1937 Patented May 31, 1938 UNITED 'STATES PATENT OFFICE CASEMENT WINDOWV OPERATOR tion of yIllinois Application May 17, 1937, Serial No. 143,143

2 Claims.

The objects of this invention are to improve easement window operators, particularly with reference to a back lash take-up means for the operating gearing, to the manner of mounting the window actuating arm, and to a particularly simple hard grease holding encasing means for the gearing.

The objects of the invention are attained by the construction illustrated in the drawing wherein:

Fig. 1 is a perspective View of the operator and shows a fragment of the window frame to'which it is applied and of the window operated thereby.

Fig. 2 is a bottom view partly broken away of the operator.

Fig. 3 is a longitudinal sectional detail of the assembled mechanism.

Fig. 4 is a perspective view of a worm supporting clip.

Fig. 5 is a sectional View of the worm.

Fig. 6 is a plan of the worm Wheel.

Fig. '7 shows in plan a serrated washer for use between the worm wheel and a window operating arm for rigidly connecting these two together.

Casement window operators are required in large quantities and at low cost. To meet this condition with a superior article free from rattle, durable, capable of retaining hard grease for the gears for many years and keeping the gears entirely covered and clean is attained by the arrangement herein disclosed.

The construction is reversible for right or left hinged windows and while, for the sake of clearness, is shown in Fig. 1 as mounted on top of the stool of the window frame. It is equally Well adapted to be secured in invisible position to the underside of the stool board.

As customary in casement window operators of this class, the principal elements of the construction are a worm and worm wheel mounted for locking gear operation in a support, an arm pivoted to the support and operated by the gearing, and anchor means secured to the window, with which the free end of the arm slidingly engages. The improvements have to do mainly with the manner of mounting the gears and the arm on the enclosing case for the gears. The gear mounting includes a take-up means for minimizing play or back lash.

In the drawing the gear casing I is an integral pressed shell providing top and side walls. 'Ihe latter are apertured at 2 and 3 to permit the insertion of a crank at either side and there is an aperture 4 for receiving a take-up screw 5 for the gear. At the location of Worm 6, the top of the casing is curved out as at 1 and receives welded thereto a resilient worm lclip 8. The worm clip provides an adjustable bearing for the worm whereby it may be drawn toward worm wheel 9 for the purpose of taking up all back lash between the two. At its lower end the worm clip has a curved tongue I0 for interlocking engagement with a strap at the slot I2 therein. At its opposite end the strap has a threaded boss I3 for the reception of the adjusting screw 5.

In Fig. 3 the strap I3 is shown drawn to the right as far as it will go and as limited by engagement between the teeth of the worm and worm wheel. The clip 8 and strap II form both the bearing for the worm and the take-up means for the gearing.

The worm as shown in Fig. 5, has square openings I4 at its ends for the reception of the square shank of the crank I5. Inward motion of the crank when applied from either side is limited by a central web I6 of the worm.

The top of the shell I has a central opening I'I and the clip 8 also has a coaxial opening |8 for the reception of a bronze bearing bushing I9. Within this bushing is a collar 20 serrated on both sides in order to grip and make rigid, the worm wheel 9 and operating arm 2|, which are similarly faced with coacting serrations. When rivet 22 is applied gear 9, collar 2|), arm 2|, and the rivet are made a rigid unit turnable in the bearing.

The arm 2| slidingly engages a fiber lined anchor slide 23 pivoted in a sash anchor 24 secured to the window sash.

The case I has at its corners counter-sunk attaching screw receiving apertures 25. In the application of the operator it may be mounted as shown in Fig. 1 on the Window frame stool 26 against the sash stop 21.

The operation is the same as customary with sash operators of the same class. 'Ihe turning of the gears by crank I5 oscillates arm 2| to open or close the Window. The gear take-up means insures silent operation, no free play of the crank, and freedom from rattle when a window is set in its various adjustable positions.

I claim:

1. A construction of the class described, comprising a shell casing for enclosing gearing, said shell having therein a semi-circular band for partly enclosing and forming a bearing for a worm, one end of said band being anchored to the casing, an adjustable take-up means for said band mounted in said casing and engaging the free end of said band, a Worm located in the band,

said worm having end sockets for receiving a crank, the sides of said casing being perforated in alinement with the crank-receiving sockets of the worm, and a worm Wheel within the casing intermeshing with the Worm for receiving power therefrom.

2. A construction of the class described, comprising a gear-enclosing shell, a semi-circular resilient band within said casing and attached thereto at one end, a worm supported within said band, a Worm Wheel journaled in the casing and meshing with the Worm, means for drawing the worm toward the Worm wheel, and consisting of a member having a slot and tongue connection with the free end of said band, and a screw mounted in the casing for engaging and shifting said member.

FORREST C. GARRISON. 

